I haven't as such but I do believe in them. Why wouldn't they exist? I think I heard them and I would like to go on an investigation with a team of investigators to some haunted house to see what we can find.

hey you may had heard anything, without seen them how can you say they exist. And if you want to investigate you have to go alone, that is the rule. If you go with a team you can't find them, thats what i heard.